stop
break
cease
close
drop
end
halt
hold
kill
pause
put an end to
quit
stall
stand
stay
conclude
desist
discontinue
finish
refrain
scrub
tarry
terminate
be over
blow off
break off
call it a day
cold turkey
come to a standstill
cool it
cut out
cut short
draw up
hang it up
pull up
quit cold
run its course
shut down
sign off
wind up
wrap up